Floating annular toothed gearing



Jan; 14, 1947. B, G, BAR-m 2,414,134

FLOATING ANNULAR TOOTHED GEARING Filed Aug. 9, 1945 Q Y I ,4 k

Patented Jan. 14, 1947 FLOATING ANNULAR TOOTHED GEARING Benson George Willis Bartlett, Darlington, England, assignor of one-half to Northern Patent Developments, Limited, Darlington, England, a company of Great Britain and Northern Ireland Application August 9, 1945, Serial No. 609,758

In Great Britain August 12, 1943 r 1 2 Claims.

This invention relates to floating annular toothed gearing of the type wherein a toothed gear is disposed on the inner surface of an annular floating ring and is adapted to engage an externally toothed pinion, and an external gear comprising spur or sprocket teeth or pulley surface is provided externally of -the said annular. ring and is adapted to be engaged by a toothed gear wheel, a chain or a belt for the Purpose of transmitting a drive to or from the said inner toothed pinion.

The object of the invention is toprovide improvements in annular floating gearing of the type described.

Annular floating toothed gearing of the type described, according to this invention, is characterized in that the internal toothed gear of the annular ring and the coengaging toothed pinion accompanying drawing:

Fig, i is a fragmentary part sectional elevation; and

ids. 2 is a corresponding transverse sectional elevation.

The annular floating ring I i is provided with an external pulley surface it, adapted to be engaged by a belt by which a drive is transmitted from a driving member (not shown), and an internal toothed gear l4 adapted to engage the teeth of a toothed pinion l5 mounted on a spindle it to which the said drive is to be transmitted.

Two rings ill and Iiiaremounted in an external circumferential recess IS in the pinion it, the ring it being outside the ring I 'i and having an internal diameter greater than the external diameter of the ring H, the ring I! having an internal diametergreater than the external diameter of the recess it in the pinion I! on which it is mounted. The outer ring I8 is also adapted to lie in an internal recess 20 in the annular ring ii, and its external diameter is less than the diameter of the recess 20.

When the internal gear ll of the annular ring ii is in mesh with the toothed pinion It the two rings l1 and It are disposed between the said gears, the thicknesses of the rings l1 and it being such that thepoint of contact between the internal surface of the outer ring I. and the external surface of the inner ring I1 is on the pitch circles of the gears I4 and I5.

when transmitting a drive the annular floating ring will clip on the rings l1 and it into the return run oi the belt, the ring I8 will in turn clip on to the ring i1 and the ring ii on the toothed pinion, and the forward and return runs oi the belt will be automatically placed under tension, and the possibility of serious belt slip will thereby be considerably reduced when transmitting a high velocity drive in this particular instance over small diameter co-actlng sprockets. pulley surfaces or the like.

As will be seen in Fig. 2, the toothed gear it is formed in two portions, one at each edge of the floating ring ii and the teeth oi the toothed pinion i B are similarly formed; the loose rings ii and it are disposed between the two separateportions of the two engagin gears it and it and thereby prevent relative lateral disengaging movement of said gears.

- It will be recognized that the means specified will be particularly efdcient when the mechanism is functioning under excessive loads.

What I claim and desire to secure by Letters Patent is: r

l. Annular floating toothed gearing wherein a toothed gear disposed on the inner surface of an annular floating ring is engaged by toothed gearing on a pinion and the external surface of the said annular floating rin is engaged by a member for the purpose of transmitting a drive through said pinion, the internal surface of said annular floating ring is annularly grooved, the diameter of said groove being greater than the pitchdiameter of said internal gear on said annular floating ring, a first loose ring is disposed free and floating within said groove in said annular floating ring, the external diameter of said first loose ring being less than the diameter of said groove and the radial thicknessof said first loose ring being equal to the diiierence between the diameter of said groove and the pitch diameter of said internal gear, the said pinion i circumferentially grooved, the diameter of said groove being less than the pitch diameter of the toothed gear on said pinion, a second loose ring is disposed free and floating within said groove'in said pinion, the internal diameter of said second loose ring being greater than the diameter of said pinion groove, the radial thickness of said second loose ring beirg equal to the diflerence between the diameter of said pinion groove and the pitch diameter of the tooth gear on said pinion, the external diameter of said second loose ring being less than the internaldiameter of said first loose ring, and the said second loose ring being disposed within said first loose ring so that the external surface oi. the second loose ring abuts the internal surface of said first loose ring at the point of engagement of said internal toothed gear on said annular floating ring with the toothed gear on said pinion, where- 2. Annular floating toothed gearing according to claim 1, wherein the said grooves on the said annular floating ring and on the said pinion are disposed between the lateral edges of the said toothed gears whereby portions of said toothed gears are disposed on both lateral sides of said grooves and said loose rings and whereby said loose rings operate to prevent relative lateral disengaging movement of the said two co-acting by the said two gears are restrained from mesh- 10 toothed gears and retain them in mesh.

ing below their pitch circles.

BENSON GEORGE WILLIS BARTLETT. 

